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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

39405 results found.

  1. GRB 120422A: i-band re-brightening and possible SN detection
  2. GRB 120427A: MASTER follow up observations
  3. GRB 120422A: optical observations
  4. Konus-Wind observation of GRB 120427A
  5. IPN Triangulation of GRB 120427A
  6. Swift detection of 4U 1630-47
  7. GRB 120422A, the review of the sky area in plate archives
  8. Konus-Wind observation of GRB 120426A
  9. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  10. IPN Triangulation of bright GRB 120426A
  11. GRB 120422A: MITSuME Ishigakijima upper limit
  12. Swift Trigger 520928 is probably not a burst
  13. GRB 120424A: MAXI/GSC detection of a burst
  14. GRB 120422A: 272 GHz observations from SMA
  15. GRB 120422A: JCMT SCUBA-2 sub-mm observation
  16. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  17. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  18. GRB 120422A GROND observations
  19. GRB 120422A: Super-LOTIS early observations
  20. GRB 120422A: EVLA Detection
  21. GRB 120422A: Xinglong TNT optical upper limit
  22. GRB 120422A: NOT optical observations
  23. GRB 120422A: Gemini redshift of candidate host
  24. GRB 120422A: Zadko observatory - Gingin optical observations
  25. GRB 120422A: Swift-XRT refined Analysis
  26. GRB 120422A: A Swift/UVOT Detection
  27. GRB 120422A: Enhanced Swift-XRT position
  28. GRB 120422A: Swift-BAT refined analysis
  29. GRB 120422A: Gemini observations
  30. GRB 120422A: Faulkes Telescope North observations
  31. GRB 120422A: Swift detection of a burst
  32. GRB 120419A: Swift-XRT and UVOT observations
  33. GRB 120419A: A long GRB detected by INTEGRAL
  34. Swift Trigger 519874 is probably a noise event
  35. Trigger 519868: Swift detection of SGR1806-20
  36. GRB 120404A: optical observations in Mondy observatory
  37. GRB 120404A: optical observations
  38. GRB 120404A, Optical Observations
  39. GRB 120404A: JCMT SCUBA-2 sub-mm observation
  40. GRB 120404A: SMARTS optical/IR observations
  41. GRB 120404A: EVLA Detection
  42. GRB 120404A: MASTER OT observations
  43. GRB120404A: GROND observations show steeply decaying afterglow
  44. GRB 120404A: VLT/X-shooter redshift confirmation
  45. GRB 120404A: Swift/UVOT Detection
  46. GRB 120404A: MITSuME Ishigakijima Optical Observation
  47. GRB 120404A: MITSuME Okayama Optical Observation
  48. GRB 120403B: Swift-XRT refined Analysis
  49. GRB 120404A: Swift-XRT refined Analysis
  50. GRB 120404A : TNT optical observation
  51. GRB 120404A: Swift-BAT refined analysis
  52. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  53. GRB 120404A: Enhanced Swift-XRT position
  54. GRB 120404A: Gemini-N Redshift correction
  55. GRB 120402B: MASTER early OT limit
  56. GRB 120403B: TAROT La Silla observatory optical observations
  57. GRB 120403B: Fermi GBM Observation
  58. GRB 120404A: Gemini-N Redshift
  59. GRB 120403B: AAT nIR observations
  60. GRB 120404A: MITSuME Akeno Optical upper limits
  61. GRB 120404A: MASTER early OT limit
  62. GRB 120404A: Faulkes Telescope North afterglow confirmation
  63. GRB 120404A: Swift detection of a burst with an optical counterpart
  64. GRB 120403B: Swift-BAT refined analysis
  65. GRB 120403B: Swift/UVOT Upper Limits
  66. GRB 120403B: Enhanced Swift-XRT position
  67. GRB 120403A: Swift/BAT spectral lag analysis
  68. GRB 120403B: Swift detection of a burst
  69. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  70. GRB 120326A, the review of the sky area in plate archives
  71. GRB 120402A: optical upper limit
  72. GRB 120320A: optical upper limit in Mondy observatory
  73. GRB 120320A: early optical upper limit
  74. GRB 120403A: MASTER follow up observations
  75. GRB 120402A: MASTER follow up observations
  76. GRB 120403A, Swift-BAT refined analysis
  77. GRB 120402B: Fermi GBM detection
  78. GRB 120328B: Pi of the Sky simultaneous upper limits
  79. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  80. GRB 120403A: Swift detection of a burst
  81. GRB 120402A: Swift detection of a possible burst or noise
  82. GRB 120326A: Cima Rest and Bassano Brescia
  83. GRB 120327A: SMARTS optical/IR afterglow observations
  84. GRB 120401A: Swift-XRT refined Analysis
  85. GRB 120401A: Swift-BAT refined analysis
  86. GRB 120326A: HCT optical observations
  87. GRB 120401A: Enhanced Swift-XRT position
  88. GRB 120401A: Prompt enhanced Swift-XRT position
  89. GRB 120401A: Swift detection of a burst
  90. GRB 120326A: EVLA Observations
  91. GRB 120324A: CrAO optical upper limit
  92. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  93. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  94. GRB 120326A : Suzaku WAM observation of the prompt emission
  95. GRB 120326A: CARMA 3mm detection
  96. GRB 120324A, the review of the sky area in plate archives
  97. Swift trigger 518853 is most likely GX 301-2
  98. GRB 120326A: Bassano Bresciano Observatory optical observations
  99. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  100. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst

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